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Bulletin issued at 01:02 HKT 02/Sep/2017

At 1 a.m. at the Hong Kong Observatory the air temperature was 27 degrees Celsius and the relative humidity 84 per cent.

The air temperatures at other places were:

King's Park 26 degrees;
Wong Chuk Hang 25 degrees;
Ta Kwu Ling 25 degrees;
Lau Fau Shan 26 degrees;
Tai Po 25 degrees;
Sha Tin 25 degrees;
Tuen Mun 25 degrees;
Tseung Kwan O 25 degrees;
Sai Kung 26 degrees;
Cheung Chau 26 degrees;
Chek Lap Kok 28 degrees;
Tsing Yi 25 degrees;
Shek Kong 25 degrees;
Tsuen Wan Ho Koon 25 degrees;
Tsuen Wan Shing Mun Valley 24 degrees;
Hong Kong Park 25 degrees;
Shau Kei Wan 27 degrees;
Kowloon City 27 degrees;
Happy Valley 25 degrees;
Wong Tai Sin 25 degrees;
Stanley 26 degrees;
Kwun Tong 27 degrees;
Sham Shui Po 26 degrees;
Kai Tak Runway Park 27 degrees;
Yuen Long Park 26 degrees;
Tai Mei Tuk 25 degrees.

Here is the information on Tropical Storm Mawar at 11:00 p.m. yesterday:
Location: 21.2 degrees north, 118.3 degrees east.


Note: The data above is provisional. Only limited data validation has been carried out.


Climatological Information for 2 Sep

Regional Weather in Hong Kong

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Hong Kong Climatology


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Bulletin updated at 00:45 HKT 02/Sep/2017

Here is the latest weather bulletin issued by the Hong Kong Observatory.

A continental airstream affected Guangdong yesterday. Locally, it was hazy with sunny periods. Thundery showers triggered by high temperatures brought more than 30 millimetres of rainfall to Sai Kung, Tuen Mun and Lantau Island in the evening. Besides, the tropical depression over the northeastern part of the South China Sea was named Mawar yesterday morning, and intensified into a tropical storm yesterday night. Mawar is expected to move in the general direction of eastern Guangdong today and tomorrow. Weather over the region will become unsettled with heavy squally showers.

At 11 p.m. last night, Mawar was centred about 180 kilometres east-northeast of Dongsha. It is forecast to move north-northwest slowly in the general direction of the coast of eastern Guangdong.

Weather forecast for Hong Kong

Mainly cloudy with a few showers. The minimum temperature will be about 26 degrees. Hazy with sunny intervals during the day. The maximum temperature will be around 32 degrees. Showers will be heavier at times with squally thunderstorms later. Moderate northerly winds, occasionally fresh offshore later.

Outlook : Windier with occasional squally showers in the following couple of days.


(The above forecast period is valid up to 23:59 HKT today, 02/09/2017; Regular update at : around 45 minutes past each hour, 16:15 HKT and 23:15 HKT)

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MARINE FORECAST
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Marine Forecast

Weather Information for the Marine Community

Bulletin issued at 21:00 HKT 01/Sep/2017

STORM WARNING AREAS: KWANGTUNG, BASHI AND PRATAS.
GALE WARNING AREA: BALINTANG.

GENERAL SITUATION AT 010900 UTC:
FOR DETAILS ON TROPICAL DEPRESSION MAWAR (1716), PLEASE REFER TO THE 3-HRLY SHIPPING WARNINGS.

MARINE FORECAST FOR 24 HOURS FROM 011300 UTC:

HONG KONG= N 4-5, 6 LATER. DOWN TO 2000 M IN ISOL HEAVY SQUALLY SHOWERS AND TS. DOWN TO 4000 M IN SOME HAZE.. SEA 2 M, 3 M LATER. SWELL E UP TO 2 M. TEMP 26-32 C. =
KWANGTUNG= N TO NE 7-8, BEC 10 IN E. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 3-4 M, UP TO 10 M IN E LATER. SWELL E TO NE 2-3 M. =
TAIWAN STRAIT= NE 6-7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA 3-4 M. SWELL SE 2-3 M. =
BASHI= CYCLONIC 7-8, BEC 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 10 M. SWELL NE 3 M, SE 3 M. =
PRATAS= NE 7-8, BEC CYCLONIC UP TO 10. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA 4-6 M, BEC 10 M. SWELL NE 3 M. =
BALINTANG= SW 7-8, OCNL 9. DOWN TO 500 M IN FRQ HEAVY SQUALLY SHOWERS AND TS. SEA UP TO 8 M. SWELL NE 3 M, SE 3 M. =
SCARBOROUGH= W TO SW 6, OCNL 7. DOWN TO 2000 M IN SCT SQUALLY SHOWERS AND TS. SEA UP TO 4 M. SWELL NE 2-3 M. =
PARACEL= W TO NW 5-6. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA 2-3 M. SWELL E TO NE 2-3 M. =
TONKIN= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. =
DANANG= SW 4-5. DOWN TO 4000 M IN ISOL SQUALLY SHOWERS AND TS. SEA UP TO 2 M. SWELL E TO NE 2 M. =
NNNN
Abbreviations:
KT, VRB, SLW, FRQ - knot, variable, slow, frequent STNR, QSTNR, C - stationary, quasi-stationary, degrees celsius WKN, INTSF, INTST, NC - weaken, intensify, intensity, no change LGT, ISOL, SCT, OCNL - light, isolated, scattered, occasional CLD, DZ, TS - cloudy, drizzle, thunderstorm

The date and time are specified by a 6-digit number DDHHMM. DD stands for the day of month, HH represents the hour while MM indicates the minute in UTC.


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    • SOUTH CHINA COASTAL WATERS
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    South China Coastal Waters

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    Bulletin issued at 23:55 HKT 01/Sep/2017

    Weather information for south China coastal waters issued by the Hong Kong Observatory at 11:55 p.m. on 01 September 2017

    Warnings:
    Storm force winds in Nan'ao and Shanwei. Strong winds in Hong Kong adjacent waters, south of Hong Kong and Shangchuan Dao.

    Weather Situation:
    At 11 p.m., Tropical Storm Mawar with maximum sustained winds of about 65 kilometres per hour near its centre was located at 21.2 degrees north, 118.3 degrees east. It is forecast to move north-northwest slowly in the general direction of the coast of eastern Guangdong.

    Area forecasts for the next 24 hours

    Hong Kong Adjacent Waters:
    North force 4 to 5, force 6 later.
    Isolated heavy squally showers and thunderstorms. Some haze.
    Moderate seas, becoming rough later.

    Nan'ao:
    Cyclonic force 8 to 9, becoming cyclonic up to force 10.
    Frequent heavy squally showers and thunderstorms.
    Very rough to high seas.

    Shanwei:
    North to northeast force 8, becoming force 9 to 10 later.
    Frequent heavy squally showers and thunderstorms.
    Rough to very rough seas, becoming high later.

    South of Hong Kong:
    North to northwest force 6 to 7.
    Scattered heavy squally showers and thunderstorms.
    Rough seas.

    Shangchuan Dao:
    Northwest force 5 to 6.
    Scattered squally showers and thunderstorms.
    Moderate to rough seas.

    Outlook for the next 48 hours
    Westerly winds of force 7 to 8, cyclonic winds up to force 12 in east at first. Frequent heavy squally showers and thunderstorms.

    Latest reports from south China coastal weather stations
    --------------------------------------------------------

    Waglan Island Wind northwest force 2
      Visibility 14 Kilometres

    Shantou Wind east-northeast force 2
      Visibility 23 Kilometres

    Dongsha Wind north force 4
      Visibility 9 Kilometres in rain

    Macau Wind north-northwest force 1
      Visibility 28 Kilometres

    Xisha Wind southwest force 2
      Visibility 30 Kilometres

  • Explanation of Seas or Sea Waves
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    • WEATHER FORECAST FOR LOCAL AVIATION
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    Weather Forecast for Local Aviation

    Bulletin issued at 01:30 HKT 02/SEP/2017
    (Next update at 9:00-9:30 HKT 02/SEP/2017)
    I.   SIGNIFICANT WEATHER WITHIN 100 KILOMETER RADIUS OF H.K :
     ISOL CUNIM/TS AND ASSOCIATED HAZARDS.
II.  SYNOPSIS OF THE WEATHER SITUATION :
     AT 11 P.M. LAST NIGHT,  TROPICAL STORM MAWAR WAS
     CENTRED NEAR 21.2 DEGREES NORTH, 118.3 DEGREES
     EAST. IT IS FORECAST TO MOVE NORTH-NORTHWEST
     SLOWLY IN THE GENERAL DIRECTION OF THE COAST OF
     EASTERN GUANGDONG.
III. FORECAST FOR 100-KILOMETER RADIUS AROUND HONG KONG
     FROM 0200 TO 1200 HKT:
             WIND                           TEMPERATURE (DEG. C)
   A.   SURFACE:  360/5-10
                  TEMPO VRB/20G30 IN TS
       OFFSHORE:  340/15                               25-33
   B.   2000 FT:  020/10-15                            23
   C.   5000 FT:  020/25                               20
   D.  10000 FT:  020/25                               11
   E.  18000 FT:  030/25                               MS3
   F.  24000 FT:  040/25                               MS12
   G.  30000 FT:  040/25                               MS26
   H. INVERSION LEVEL(S) (ONLY WHEN BELOW 5000 FEET) : 
      NIL.
   I. WEATHER       : 
      MAINLY CLOUDY WITH A FEW SHOWERS. HAZY WITH
      SUNNY INTERVALS DURING THE DAY.  ISOLATED
      SQUALLY THUNDERSTORMS LATER.
   J. CLOUD (HEIGHT ABOVE MSL) : 
      FEW 2000 FT  SCT 4000 FT.  TEMPO FEW CB 1000 FT
      SCT 2000 FT  BKN 4000 FT.
   K. VISIBILITY    : 7 KM.  TEMPO 4000 M IN SHOWERS/HAZE.  TEMPO 2000 M IN TS.
   L. 0 DEG. C LEVEL: 16500 FT      10 DEG. C LEVEL(S) : 10600 FT
   M. TURBULENCE    : MOD TO SEV NEAR CUNIM/TS.
   N. SEA STATE     : 1.0-1.5 M     SEA TEMPERATURE    : 29 DEG
IV.  FURTHER OUTLOOK: 
     MODERATE NORTHERLY WINDS, OCCASIONALLY  FRESH
     OFFSHORE.  HAZY WITH SUNNY INTERVALS. SHOWERS
     WILL BE HEAVIER AT TIMES WITH SQUALLY
     THUNDERSTORMS LATER.=

    ===================================================================
Note: The forecast could be updated before the next issue time 
whenever there is newly expected occurrence or non-occurrence 
of significant weather as described below which may be hazardous 
to aircraft within 100-km radius of Hong Kong:

(a) Change of the tropical cyclone category
(b) Strong, Gale, Storm, and Hurricane force winds
(c) Thunderstorm/CBs
(d) Severe gusts
(e) Severe turbulence
(f) Significant low stratus
(g) Fog or thick haze/sandstorm/duststorm 
    causing significant reduction of visibility
(h) Volcanic ash
(i) Radioactive cloud
===================================================================
    Aviation Weather Observation and Forecast Information for Hong Kong International Airport
    To know more about clouds, please see Commonly observed clouds in Hong Kong.

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    Significant Weather Information (SIGMET)

    The Airport Meteorological Office is responsible for monitoring hazardous weather and phenomena in the atmosphere that may affect the safety of aircraft operations within a designated airspace over the northern part of the South China Sea. Weather forecasters at the Airport Meteorological Office issues SIGMET information when hazardous weather and phenomena in the atmosphere such as thunderstorms, tropical cyclones, turbulence, icing occur or are expected to occur in the airspace.

    The latest significant weather information
    issued by the Hong Kong Observatory at 01:00 HKT on 02 Sep 17

    VHHK SIGMET 7 VALID 011300/011700 VHHH- VHHK HONG KONG FIR EMBD TS FCST NE OF LINE N1848 E11542 - N2236 E11400 TOP FL420 MOV SW 10KT NC= VHHK SIGMET 8 VALID 011700/012100 VHHH- VHHK HONG KONG FIR EMBD TS FCST WI N2100 E11730 - N1918 E11606 - N1918 E11518 - N2248 E11500 - N2300 E11518 - N2342 E11730 - N2100 E11730 TOP FL450 STNR NC=

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    Tropical Cyclone Warning
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    Tropical Cyclone Warning

    There is no tropical cyclone warning signal.

    For other tropical cyclone related information, please visit the World Meteorological Organization Web Site - Severe Weather Information Centre.

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    TROPICAL CYCLONE WARNING FOR SHIPPING
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    Tropical Cyclone Warning for Shipping

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    Bulletin issued at 00:30 HKT 02/Sep/2017


    Tropical Cyclone Warning

    At 011500 UTC, Tropical Storm Mawar (1716) with central pressure 994 hectopascals was centred within 90 nautical miles of two one point two degrees north (21.2 N) one one eight point two degrees east (118.2 E) and is forecast to move north-northwest slowly for the next 24 hours.

    Maximum winds near the centre are estimated to be 35 knots.

    Radius of over 33 knot winds 90 nautical miles over northern semicircle, 60 nautical miles elsewhere.
    Radius of over 2 metre waves 150 nautical miles over northern semicircle, 120 nautical miles elsewhere.

    Forecast position and intensity at 021500 UTC
    Two one point nine degrees north (21.9 N)
    One one seven point four degrees east (117.4 E)
    Maximum winds 50 knots.

    Forecast position and intensity at 031500 UTC
    Two three point four degrees north (23.4 N)
    One one six point zero degrees east (116.0 E)
    Maximum winds 55 knots.

    Forecast position and intensity at 041500 UTC
    Dissipated over land.



    The Hong Kong Observatory's tropical cyclone warnings for shipping are issued about one and a half hours after the time of observation. They incorporate additional information derived from surface and upper-air data and may therefore be slightly different from the real-time satellite or radar-based positions given in the hourly bulletins for public.

    While the forecast positions and track indicate the most likely future path of the tropical cyclone, they may deviate from the actual path taken by the storm.

    Tropical Cyclone Track
    YESTERDAY'S WEATHER AND RADIATION LEVEL Skip to main content
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    Yesterday's Weather and Radiation Level

    Bulletin issued at 00:15 HKT 02/Sep/2017 
    HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     31.7 C
Minimum Air Temperature                     26.1 C
Grass Minimum Temperature                   24.7 C
Relative Humidity                        68 - 98 Percent
Rainfall                                     6.5 mm 
Total rainfall since 1st January          2255.4 mm
Against an average of                     1918.8 mm

Other Stations                Min                  Max
King's Park                  25.6 C               32.1 C
Wong Chuk Hang               24.6 C               32.7 C
Ta Kwu Ling                  24.8 C               33.6 C
Tai Po                       24.8 C               32.1 C
Sha Tin                      25.7 C               33.5 C
Tuen Mun                     25.2 C               33.4 C
Tseung Kwan O                24.8 C               33.4 C
Sai Kung                     25.5 C               32.5 C
Cheung Chau                  24.8 C               34.3 C
Chek Lap Kok                 24.8 C               33.6 C
Tsing Yi                     24.9 C               33.4 C
Shek Kong                    24.5 C               34.2 C
Tsuen Wan Ho Koon            23.8 C               31.8 C
Tsuen Wan Shing Mun Valley   24.1 C               33.1 C
Hong Kong Park               24.9 C               32.0 C
Shau Kei Wan                 25.1 C               33.6 C
Kowloon City                 25.3 C               33.6 C
Happy Valley                 25.5 C               34.0 C
Wong Tai Sin                 24.3 C               34.0 C
Stanley                      25.6 C               32.0 C
Kwun Tong                    24.9 C               33.4 C
Sham Shui Po                 25.7 C               33.4 C
Kai Tak Runway Park          25.7 C               33.5 C
Yuen Long Park               25.3 C               35.1 C
Tai Mei Tuk               24.9 C               33.1 C

Duration of sunshine (King's Park):              2.4 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 7.
Sea surface temperature (Waglan Island):        27.2 C 

Yesterday's (01 Sep 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 microsievert per hour.  These are within the normal
range of fluctuation of the background radiation level in
Hong Kong (see Note). The average dose rates measured at the
radiation monitoring stations over various parts of the
territory were as follows :

Station                     Yesterday's average
                            (microsievert/hour)
Ping Chau                           0.08
Tap Mun                             0.09
Kat O                               0.08
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

Note

      

    1. From readings taken at various locations in Hong Kong during
the period 1987-2016, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.

    2. The extent of health effects to a person as a result of
exposure to radiation is expressed by a physical quantity
called equivalent dose, in unit of sievert.  Protective
action may be required if there is an increase in the
ambient gamma dose rate above background such that the total
additional dose is expected to exceed 5000 microsieverts in
a relatively short period of time. For example, a dose of
5000 microsieverts may be reached when the ambient gamma
dose rate is 1000 microsieverts per hour (several thousand
times above background) and lasts for 5 hours.

    3. The readings of ambient gamma radiation level from
instrument are expressed in unit of gray, which is
numerically equal to the gamma dose expressed in sievert.
    Climatological Information for 01 Sep
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